I need to use my daughter's old iPhone 5 as an iPod for a single event (so I can connect it to external speakers via its headphone socket, which my iPhone 7 doesn't have). To do so I need to sync it to my laptop to transfer over the music I need for the event. But it's only the music that I want to sync; I don't want to interfere with any other content on the iPhone 5 — photos, apps (and their data), etc etc I want to leave untouched. Is this possible?
Oh, and of course she's a teenager so this phone has almost certainly never been synced to a computer (or if it has then not for two years or more) so the idea of 'simply resync it from your daughter's computer afterward to put everything back as it was' is unlikely to be a workable option. And it's not her current phone anyway.